module ActiveRecord module Validations class AssociatedValidator < ActiveModel::EachValidator #:nodoc: def validate_each(record, attribute, value) if Array(value).reject { |r| valid_object?(r) }.any? record.errors.add(attribute, :invalid, options.merge(value: value)) end end private def valid_object?(record) (record.respond_to?(:marked_for_destruction?) && record.marked_for_destruction?) || record.valid? end end module ClassMethods # Validates whether the associated object or objects are all valid. # Works with any kind of association. # # class Book < ActiveRecord::Base # has_many :pages # belongs_to :library # # validates_associated :pages, :library # end # # WARNING: This validation must not be used on both ends of an association. # Doing so will lead to a circular dependency and cause infinite recursion. # # NOTE: This validation will not fail if the association hasn't been # assigned. If you want to ensure that the association is both present and # guaranteed to be valid, you also need to use # {validates_presence_of}[rdoc-ref:Validations::ClassMethods#validates_presence_of]. # # Configuration options: # # * :message - A custom error message (default is: "is invalid"). # * :on - Specifies the contexts where this validation is active. # Runs in all validation contexts by default (nil). You can pass a symbol # or an array of symbols. (e.g. on: :create or # on: :custom_validation_context or # on: [:create, :custom_validation_context]) # * :if - Specifies a method, proc or string to call to determine # if the validation should occur (e.g. if: :allow_validation, # or if: Proc.new { |user| user.signup_step > 2 }). The method, # proc or string should return or evaluate to a +true+ or +false+ value. # * :unless - Specifies a method, proc or string to call to # determine if the validation should not occur (e.g. unless: :skip_validation, # or unless: Proc.new { |user| user.signup_step <= 2 }). The # method, proc or string should return or evaluate to a +true+ or +false+ # value. def validates_associated(*attr_names) validates_with AssociatedValidator, _merge_attributes(attr_names) end end end end